﻿#region Header

// // <copyright file="UnifyConfiguration.cs">
// // Copyright (c) 2013, Nicolas Anderlini
// // All rights reserved.
// // 
// // Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
// // 
// //     - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
// //     - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
// //     - Neither the name of Nicolas Anderlini nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
// // 
// // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// // </copyright>
// // <author>Nicolas Anderlini</author>
// // <email>nicolas.anderlini@live.fr</email>
// // <date>08-02-2013</date>
// // <summary></summary>

#endregion

#region

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;

#endregion

namespace Unify.Configuration
{
    public class UnifyConfiguration : IUnifyConfiguration
    {
        /// <summary>
        ///     Configuration
        /// </summary>
        private readonly UnifyConfigurationSection _configuration;

        /// <summary>
        ///     Ctor
        /// </summary>
        /// <param name="configurationSectionName"></param>
        public UnifyConfiguration(string configurationSectionName)
        {
            try
            {
                //load configuration
                _configuration =
                    (UnifyConfigurationSection)
                    ConfigurationManager.GetSection(configurationSectionName);

                if (null == _configuration)
                    throw new ConfigurationErrorsException(
                        "Configuration section missing"
                        );
            }
            catch (Exception e)
            {
                throw new ConfigurationErrorsException(
                    "Loading configuration section throw exception during initialization, see inner exception for more details",
                    e);
            }
        }

        /// <summary>
        /// </summary>
        /// <returns></returns>
        public IEnumerable<string> GetAssembliesName()
        {
            foreach (AssemblyElement assembly in _configuration.Assemblies)
                yield return assembly.Name;
        }

        /// <summary>
        /// </summary>
        /// <param name="type"></param>
        /// <returns></returns>
        public string GetLifetimeNameFromStrategyName(string strategy)
        {
            return GetStrategyElementFromStrategyName(strategy).Lifetime;
        }

        /// <summary>
        /// </summary>
        /// <param name="type"></param>
        /// <returns></returns>
        public string GetLayerNameFromStrategyName(string strategy)
        {
            return GetStrategyElementFromStrategyName(strategy).Layer;
        }

        /// <summary>
        /// </summary>
        /// <param name="verifiyTargetLayerName"></param>
        /// <param name="verifiyDependencyLayerName"></param>
        /// <returns></returns>
        public bool VerifyConstraints(string verifiyTargetLayerName, string verifiyDependencyLayerName)
        {
            bool result = false;
            foreach (LayerPlanElement lpe in _configuration.LayerPlan)
            {
                TargetLayerCollection targetLayerCollection = lpe.Constraints;
                string targetLayerName = targetLayerCollection.TargetLayer;
                foreach (
                    DependencyLayerElement dependencyLayerElement in
                        targetLayerCollection.Cast<DependencyLayerElement>())
                {
                    string dependencyLayerName = dependencyLayerElement.DependencyLayer;
                    if (targetLayerName.Equals(verifiyTargetLayerName) &&
                        dependencyLayerName.Equals(verifiyDependencyLayerName))
                    {
                        result = true;
                        break;
                    }
                }
            }
            return result;
        }

        /// <summary>
        /// </summary>
        /// <param name="strategy"></param>
        /// <returns></returns>
        private StrategyElement GetStrategyElementFromStrategyName(string strategy)
        {
            foreach (StrategyElement strat in _configuration.Strategies)
            {
                if (strat.Name.Equals(strategy))
                {
                    return strat;
                }
            }
            throw new StrategyMissingException("A referenced strategy name isnt present in the configuration");
        }
    }
}